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NiO/CuO/TiO2 ternary composites : development, physicochemical characterization and photocatalytic degradation study over Reactive Orange 30 solutions under solar light irradiation

Muthamilarasu A., Sivakumar S., Divya G., Sivakumar M., Sakthi D

Advances in Materials Science

2022

Vol. 22, nr 1(71)

36--54

The photocatalytic degradation and mineralization of Reactive Orange 30 on NiO/CuO/TiO2 ternary composites have been studied using solar light irradiation. The NiO/CuO/TiO2 ternary composites were prepared by producing ethanolic dispersions containing varied amounts of NiO and CuO/TiO2 (3wt% to 15wt.%), followed by annealing at 300 ̊ C. SEM, UV- Vis DRS, PL, XRD and FTIR analysis have been used to characterize the unary (parent photocatalysts), binary and ternary composites. Under solar light irradiation, NiO/CuO/TiO2 ternary composites exhibited an excellent photocatalytic activity in degradation of reactive orange 30 in aqueous solution, whereas the NiO/TiO2, CuO/TiO2 and bare photocatalyst such as NiO, CuO, TiO2 showed lower activities. It was deduced that the remarkable visible-light absorption phenomenon and band gap reduction of the NiO/CuO/TiO2 ternary composites taking place. It paves way for the photogenerated electron transfer between CB of the NiO, CuO, TiO2 semiconductors and also holes shifting between VB of above mentioned materials. The NiO/CuO/TiO2 ternary composite shows good photostability and the photocatalyst retains 94% of its initial activity in the seventh cycle, respectively.

Oczyszczanie ścieków z instalacji odsiarczania spalin z wykorzystaniem Fe⁰/H₂O₂

Bogacki J., Marcinowski P., Zawadzki J., Majewski M., Sivakumar S.

Przemysł Chemiczny

2017

T. 96, nr 12

2486--2490

Ścieki z instalacji mokrego odsiarczania spalin (IOS) w elektrowni zawodowej poddano oczyszczaniu z wykorzystaniem układu Fe⁰/ H₂O₂ i udowodniono, że jest to skuteczna metoda ich oczyszczania. Wartość ChZT w oczyszczanych ściekach zmniejszyła się z 394 do 204 mg/L (o 48,3%) po 15 min prowadzenia procesu przy zastosowaniu dawek reagentów Fe⁰/H₂O₂ 250/600 mg/L. Zastosowanie Fe⁰/H₂O₂ umożliwia skuteczne usunięcie metali ciężkich i boru ze ścieków, aż do 99% w przypadku Zn.

Wastewater from flue gas desulfurization (FGD) by wet-lime method in a power plant were treated by (i) sedimentation, (ii) coagulation and (iii) Fe⁰/H₂O₂ process. It was proved, that Fe⁰/H₂O₂ process is the most effective in FGD wastewater treatment. As a results COD was decreased from 394 to 204 mg/L (48.3% removal) for 15min process time and Fe⁰/H₂O₂ doses 250/600 mg/L. Fe⁰/H₂O₂ process allows effective heavy metals and boron removal.